49 lines
1.8 KiB
C#
49 lines
1.8 KiB
C#
using System;
|
|
using System.Threading.Tasks;
|
|
using DataLayer;
|
|
using Dinah.Core.ErrorHandling;
|
|
|
|
namespace FileLiberator
|
|
{
|
|
public static class IProcessableExt
|
|
{
|
|
//
|
|
// DO NOT USE ConfigureAwait(false) WITH ProcessAsync() unless ensuring ProcessAsync() implementation is cross-thread compatible
|
|
// ProcessAsync() often does a lot with forms in the UI context
|
|
//
|
|
|
|
|
|
/// <summary>Process the first valid product. Create default context</summary>
|
|
/// <returns>Returns either the status handler from the process, or null if all books have been processed</returns>
|
|
public static async Task<StatusHandler> ProcessFirstValidAsync(this IProcessable processable)
|
|
{
|
|
var libraryBook = processable.GetNextValid();
|
|
if (libraryBook == null)
|
|
return null;
|
|
|
|
// this should never happen. check anyway. ProcessFirstValidAsync returning null is the signal that we're done. we can't let another IProcessable accidentally send this commans
|
|
var status = await processable.ProcessAsync(libraryBook);
|
|
if (status == null)
|
|
throw new Exception("Processable should never return a null status");
|
|
|
|
return status;
|
|
}
|
|
|
|
public static LibraryBook GetNextValid(this IProcessable processable)
|
|
{
|
|
var libraryBooks = LibraryQueries.GetLibrary_Flat_NoTracking();
|
|
|
|
foreach (var libraryBook in libraryBooks)
|
|
if (processable.Validate(libraryBook))
|
|
return libraryBook;
|
|
|
|
return null;
|
|
}
|
|
|
|
public static async Task<StatusHandler> TryProcessAsync(this IProcessable processable, LibraryBook libraryBook)
|
|
=> processable.Validate(libraryBook)
|
|
? await processable.ProcessAsync(libraryBook)
|
|
: new StatusHandler();
|
|
}
|
|
}
|